Depositing cash USD while in Europe into European N26 account

Hello, just opened a European N26 account. I live in Europe, and have USD in cash that I would like to deposit /convert to euros without undue exchange rate losses. ie exchanging my USD locally for Euros at the tourist rate and then using N26 CASH26 deposit at a retail point would seem pointless. How can I take advantage of N26’s good exchange rates to convert my cash USD to euros while in Europe?